APPENDIX B.

THE following are the details referred to on p. 122:On August 4, 1875, I separated one of my colonies of Formica fusca into two halves, and kept them entirely apart.

On March 15 following I put in a stranger and one of the old companions from the other half of the nest at 7 A.M., and watched them longer than those previously experimented on. The stranger was very soon attacked; the friend seemed quite at home.

June 4, 1876.-8 A.M. Put into the nest a stranger and an old friend. The stranger was at once attacked, and dragged about by one of her antennæ. 9 A.M. The stranger was being attacked; the friend, though not attacked, kept rather away from the other ants. 10.30 A.M. The stranger was attacked, not the friend. 12.30 P.M. ditto, 1 P.M. ditto, 1.30 P.M. ditto, 2 P.M. ditto, 2.30 P.M. ditto, 4 P.M. ditto, 4.30 P.M. ditto. 5 P.M. The stranger was dragged out of the nest.

June 5.-Put in a stranger and a friend at 9.30. At 10 the stranger was being attacked, not the friend. 10 A.M. ditto, 10.30 A.M. ditto.

At 11 A.M. I put in another stranger and another old friend, when nearly the same thing was repeated. At 11.30 A.M. the stranger was being dragged about by her antennæ; the friend was not attacked. 12 A.M. The stranger was by herself in a corner of the nest. The friend was almost cleaned from the paint by which she was marked. I then put in another friend. At 2 P.M. the stranger was being dragged about by an antenna,